桥墩高度对桥梁隔震性能的影响研究
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摘要
以我国近海交通工程某隔震连续梁桥为研究对象,通过考虑影响隔震桥梁隔震性能的主要因素,建立其简化隔震计算力学模型,并采用有限元程序对隔震桥梁模型进行地震动时程响应模拟,以验证所采用简化力学计算模型的合理性。根据该模型研究桥墩高度对混凝土桥隔震性能的影响,分析表明:随桥墩高度逐渐增加,桥墩质量相应增加,桥梁结构自振周期延长,隔震桥的第二阶自振周期趋近于第一阶自振周期。对于低墩桥梁而言,桥墩高度对桥梁隔震性能影响显著,随着桥墩高度的不断增加,桥墩高度对桥梁隔震性能仍具有影响,但其影响程度逐渐下降。
A great traffic engineering of isolated continuous girder bridge in Chinese offshore area is taken as an example. By considering the main factors influencing of isolation performance of the isolation bridge, the simplified isolation computational mechanical model is established. The general finite element program is adopted to stimulate the ground motion time history response of isolation bridge model for verifying the rationality of simplified mechanical model. Then the effect on the performance of isolation bridge by the pier height has been studied based on the simplified mechanical model. The analysis results show that the period of bridge structure is extended, the second natural periods of isolation bridge is constantly approaching to the first natural period with the height of pier and bridge pier quality gradually increasing. The height of pier have a significant effect on the isolation performance of bridge for the low pier bridge, and with the increase of the pier height, it still has an impact on the isolation performance, but the influence gradually diminishes.
A great traffic engineering of isolated continuous girder bridge in Chinese offshore area is taken as an example. By considering the main factors influencing of isolation performance of the isolation bridge, the simplified isolation computational mechanical model is established. The general finite element program is adopted to stimulate the ground motion time history response of isolation bridge model for verifying the rationality of simplified mechanical model. Then the effect on the performance of isolation bridge by the pier height has been studied based on the simplified mechanical model. The analysis results show that the period of bridge structure is extended, the second natural periods of isolation bridge is constantly approaching to the first natural period with the height of pier and bridge pier quality gradually increasing. The height of pier have a significant effect on the isolation performance of bridge for the low pier bridge, and with the increase of the pier height, it still has an impact on the isolation performance, but the influence gradually diminishes.
引文
[1]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129(Wang Li,Yan Guiping,Sun Li.Analysis of seismic response of isolated bridges with LRB[J].Engineering Mechanics,2003,20(5):124-129(in Chinese))
[2]Hwang J S,Chiou J M.An equivalent linear model of leadrubber seismic isolation bearings[J].Engineering Structures,1996,18(7):528-536
[3]Hwang J S,Chang K C,Tsai M H.Composite damping ratio of seismically isolated regular bridges[J].Engineering Structures,1997,19(1):55-62
[4]Iemura H,Takahashi Y,Chen Y.Control of seismic energy partitioning of bridge piers with sliding rubber bearing[C]//Proceedings of the 2nd World Conference on Structure Control,1998:941-948
[5]Kelly J M.Aseismic base isolation:review and bibliography[J].Soil Dynamics and Earthquake Engineering,1986,5(4):202-216
[6]Buckle I G,Mayes R L.Seismic retrofit of bridges using mechanical energy dissipators[C]//Proceedings of the Fourth US National Conference on Earthquake Engineering.Palm Springs,California,1990:305-314
[7]Turkington D H,Carr A J,Cooke N,et al.Design method for bridges on lead-rubber bearings[J].Journal of Structural Engineering,1989,115(12):3017-3030
[8]Majid E,Mohsen T Z.Effect of seismic isolation systems on dynamic behaviour of bridges under earthquake loading[C]//Proceedings of 1lth WCEE,1996
[9]朱东生,劳远昌,沈大元,等.隔震桥梁设计参数的研究[J].土木工程学报,2000,33(5):52-56(Zhu Dongsheng,Lao Yuanchang,Shen Dayuan,et al.Research on some design parameters of seismically-isolated bridges[J].China Civil Engineering Journal,2000,33(5):52-56(in Chinese))
[10]王志强.隔震桥梁分析方法及设计理论研究[D].上海:同济大学,2000(Wang Zhiqiang.Rese arch on methods of analysis and design for isolated bridges[D].Shanghai:Tongji University,2000(in Chinese))
[11]李建中,袁万城.连续梁桥减,隔震体系的优化设计[J].土木工程学报,1998,31(3):47-54(Li Jianzhong,Yuan Wancheng.Optimal design of seismic isolation system for continuous bridge[J].China Civil Engineering Journal,1998,31(3):47-54(in Chinese))
[12]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京人民交通出版社,2001
[13]周锡元,李中锡.规则型隔震桥梁结构的简化分析方法[J].土木工程学报,2001,34(3):53-58(Zhou Xiyuan,Li Zhongxi.Simplified formulas for seismic-isolation regular bridge[J].China Civil Engineering Journal,2001,34(3):53-58(in Chinese))
[14]黄建文,朱晞,张静.隔震桥梁结构的简化反应分析及设计参数研究[J].北方交通大学学报,2004,28(1):17-22(Huang Jianwen,Zhu Xi,Zhang Jing.Simplified response analysis and research on design parameters of seismically isolated bridges[J].Journal of Northern Jiaotong University,2004,28(1):17-22(in Chinese))
[15]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129(Wang Li,Yan Guiping,Sun Li.Analysis of seismic response of isolated bridges with LRB[J].Engineering Mechanics,2003,20(5):124-129(in Chinese))
[16]杨风利.铁路桥梁减隔震设计方法及设计参数研究[D].北京:北京交通大学,2007(Yang Fengli.Study on design method and parameters for seismically isolated railway bridges[D].Beijing:Beijing Jiaotong University,2007(in Chinese))
[17]周锡元,李中锡.规则型隔震桥梁结构的简化分析方法[J].土木工程学报,2001,34(3):53-58(Zhou Xiyuan,Li Zhongxi.Simplified formulas for seismic-isolation regular bridge[J].China Civil Engineering Journal,2001,34(3):53-58(in Chinese))
[18]Hwang J S,Sheng L H,Gates J H.Practical analysis of bridges on isolation bearings with bi-linear hysteresis characteristics[J].Earthquake Spectra,1994,10(4):705-727
[2]Hwang J S,Chiou J M.An equivalent linear model of leadrubber seismic isolation bearings[J].Engineering Structures,1996,18(7):528-536
[3]Hwang J S,Chang K C,Tsai M H.Composite damping ratio of seismically isolated regular bridges[J].Engineering Structures,1997,19(1):55-62
[4]Iemura H,Takahashi Y,Chen Y.Control of seismic energy partitioning of bridge piers with sliding rubber bearing[C]//Proceedings of the 2nd World Conference on Structure Control,1998:941-948
[5]Kelly J M.Aseismic base isolation:review and bibliography[J].Soil Dynamics and Earthquake Engineering,1986,5(4):202-216
[6]Buckle I G,Mayes R L.Seismic retrofit of bridges using mechanical energy dissipators[C]//Proceedings of the Fourth US National Conference on Earthquake Engineering.Palm Springs,California,1990:305-314
[7]Turkington D H,Carr A J,Cooke N,et al.Design method for bridges on lead-rubber bearings[J].Journal of Structural Engineering,1989,115(12):3017-3030
[8]Majid E,Mohsen T Z.Effect of seismic isolation systems on dynamic behaviour of bridges under earthquake loading[C]//Proceedings of 1lth WCEE,1996
[9]朱东生,劳远昌,沈大元,等.隔震桥梁设计参数的研究[J].土木工程学报,2000,33(5):52-56(Zhu Dongsheng,Lao Yuanchang,Shen Dayuan,et al.Research on some design parameters of seismically-isolated bridges[J].China Civil Engineering Journal,2000,33(5):52-56(in Chinese))
[10]王志强.隔震桥梁分析方法及设计理论研究[D].上海:同济大学,2000(Wang Zhiqiang.Rese arch on methods of analysis and design for isolated bridges[D].Shanghai:Tongji University,2000(in Chinese))
[11]李建中,袁万城.连续梁桥减,隔震体系的优化设计[J].土木工程学报,1998,31(3):47-54(Li Jianzhong,Yuan Wancheng.Optimal design of seismic isolation system for continuous bridge[J].China Civil Engineering Journal,1998,31(3):47-54(in Chinese))
[12]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京人民交通出版社,2001
[13]周锡元,李中锡.规则型隔震桥梁结构的简化分析方法[J].土木工程学报,2001,34(3):53-58(Zhou Xiyuan,Li Zhongxi.Simplified formulas for seismic-isolation regular bridge[J].China Civil Engineering Journal,2001,34(3):53-58(in Chinese))
[14]黄建文,朱晞,张静.隔震桥梁结构的简化反应分析及设计参数研究[J].北方交通大学学报,2004,28(1):17-22(Huang Jianwen,Zhu Xi,Zhang Jing.Simplified response analysis and research on design parameters of seismically isolated bridges[J].Journal of Northern Jiaotong University,2004,28(1):17-22(in Chinese))
[15]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129(Wang Li,Yan Guiping,Sun Li.Analysis of seismic response of isolated bridges with LRB[J].Engineering Mechanics,2003,20(5):124-129(in Chinese))
[16]杨风利.铁路桥梁减隔震设计方法及设计参数研究[D].北京:北京交通大学,2007(Yang Fengli.Study on design method and parameters for seismically isolated railway bridges[D].Beijing:Beijing Jiaotong University,2007(in Chinese))
[17]周锡元,李中锡.规则型隔震桥梁结构的简化分析方法[J].土木工程学报,2001,34(3):53-58(Zhou Xiyuan,Li Zhongxi.Simplified formulas for seismic-isolation regular bridge[J].China Civil Engineering Journal,2001,34(3):53-58(in Chinese))
[18]Hwang J S,Sheng L H,Gates J H.Practical analysis of bridges on isolation bearings with bi-linear hysteresis characteristics[J].Earthquake Spectra,1994,10(4):705-727
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